gdkWindowRestack
Changes the position of window in the Z-order (stacking order), so that
it is above sibling (if above is TRUE) or below sibling (if above is
FALSE).
gdkWindowRestack(object, sibling, above)
If sibling is NULL, then this either raises (if above is TRUE) or
lowers the window.
If window is a toplevel, the window manager may choose to deny the
request to move the window in the Z-order, gdkWindowRestack only
requests the restack, does not guarantee it.
Since 2.18
Derived by RGtkGen from GTK+ documentation
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